home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Amiga Plus 1997 #1
/
Amiga Plus CD - 1997 - No. 01.iso
/
pd
/
programmierung
/
mesa-1.2.8
/
src
/
xmesap.h
< prev
Wrap
C/C++ Source or Header
|
1996-05-27
|
12KB
|
400 lines
/* $Id: xmesaP.h,v 1.28 1996/04/25 20:56:58 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 1.2
* Copyright (C) 1995-1996 Brian Paul (brianp@ssec.wisc.edu)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
$Log: xmesaP.h,v $
* Revision 1.28 1996/04/25 20:56:58 brianp
* added depth/stencil/accum_size and scrnum fields
*
* Revision 1.27 1996/03/02 21:41:05 brianp
* added PF_8R8G8B pixel format
*
* Revision 1.26 1996/03/01 20:04:36 brianp
* put the swapbytes field back in!
*
* Revision 1.25 1996/02/26 16:23:09 brianp
* added PF_5R6G5B pixel format from Joerg Hessdoerfer
*
* Revision 1.24 1996/02/23 17:13:23 brianp
* removed swapbytes field
*
* Revision 1.23 1996/02/06 03:25:43 brianp
* added new gamma correction code
*
* Revision 1.22 1995/12/30 01:04:24 brianp
* added PACK_8A8B8G8R macro
* renamed DITHER_8BIT macro as just DITHER
*
* Revision 1.21 1995/12/21 17:57:21 brianp
* added PIXELADDR2 macro, cleaned up the file a bit
*
* Revision 1.20 1995/12/13 23:29:48 brianp
* replaced OFFSET macros with PIXELADDR macros
*
* Revision 1.19 1995/11/30 00:51:40 brianp
* added casts to DITHER_HPCR macro to silence Sun compiler warnings
*
* Revision 1.18 1995/11/30 00:20:39 brianp
* added new PF_GRAYSCALE mode
*
* Revision 1.17 1995/10/30 15:14:21 brianp
* replaced Current variable with XMesa
*
* Revision 1.16 1995/10/19 15:50:38 brianp
* added rgb_flag and share_list fields
*
* Revision 1.15 1995/10/17 21:38:17 brianp
* many changes for new X/Mesa device driver
*
* Revision 1.14 1995/09/15 18:49:25 brianp
* added rowimage span buffer
*
* Revision 1.13 1995/08/24 22:07:40 brianp
* added swapbytes field
*
* Revision 1.12 1995/07/24 19:02:30 brianp
* new comments for PF_DITHER and its tables
*
* Revision 1.11 1995/05/31 14:59:55 brianp
* shm field not dependent on SHM symbol
*
* Revision 1.10 1995/05/22 20:59:34 brianp
* Release 1.2
*
* Revision 1.9 1995/04/17 13:57:14 brianp
* changed to support GLXPixmaps
*
* Revision 1.8 1995/03/30 21:10:12 brianp
* replaced colorpacking with pixelformat
*
* Revision 1.7 1995/03/22 21:38:17 brianp
* *** empty log message ***
*
* Revision 1.6 1995/03/13 20:56:23 brianp
* removed drawbuffer and readbuffer fields
*
* Revision 1.5 1995/03/08 15:10:02 brianp
* added support for dd_logicop
* added dd_clear_index and dd_clear_color
*
* Revision 1.4 1995/03/07 14:21:36 brianp
* updated for new XSetForeground/GC scheme
*
* Revision 1.3 1995/03/04 19:25:29 brianp
* 1.1 beta revision
*
* Revision 1.2 1995/03/02 19:31:42 brianp
* added defines for FRONT_PIXMAP, BACK_PIXMAP, and BACK_XIMAGE
*
* Revision 1.1 1995/02/28 21:23:31 brianp
* Initial revision
*
*/
#ifndef XMESAP_H
#define XMESAP_H
#ifdef SHM
# include <X11/extensions/XShm.h>
#endif
#include "GL/xmesa.h"
#include "context.h"
/*
* This struct is used by xmesa[12].c and glx.c only!
*/
struct xmesa_context {
struct gl_context *gl_ctx; /* the core library context */
GLboolean initialized; /* Is this context initialized yet? */
GLboolean rgb_flag; /* In RGBA mode? */
GLboolean alpha_flag; /* Need alpha buffer? */
GLint depth_size;
GLint stencil_size;
GLint accum_size;
struct xmesa_context *share_list;
Display *display; /* the X11 display */
Visual *visual; /* the X11 visual */
int scrnum; /* screen number */
GC gc1; /* GC for infrequent color changes */
GC gc2; /* GC for frequent color changes */
GC cleargc; /* GC for clearing the color buffer */
GLboolean swapbytes; /* Host byte order != display byte order? */
GLuint db_state; /* 0 = single buffered */
/* BACK_PIXMAP = use Pixmap for back buffer */
/* BACK_XIMAGE = use XImage for back buffer */
Drawable frontbuffer; /* either a window or pixmap */
Pixmap backpixmap; /* back buffer Pixmap */
XImage *backimage; /* back buffer XImage */
Drawable buffer; /* the current buffer, either equal to */
/* frontbuffer, backpixmap or XIMAGE (None) */
GLuint shm; /* X Shared Memory extension status: */
/* 0 = not available */
/* 1 = XImage support available */
/* 2 = Pixmap support available too */
#ifdef SHM
XShmSegmentInfo shminfo;
#endif
XImage *rowimage; /* Used for optimized span writing */
GLuint width, height; /* size of buffer */
GLuint depth; /* bits per pixel (1, 8, 24, etc) */
GLint bottom; /* used for FLIP macro below */
GLubyte *ximage_origin1; /* used for PIXELADDR1 macro */
GLint ximage_width1;
GLushort *ximage_origin2; /* used for PIXELADDR2 macro */
GLint ximage_width2;
GLuint *ximage_origin4; /* used for PIXELADDR4 macro */
GLint ximage_width4;
GLfloat RedGamma; /* Gamma values, 1.0 is default */
GLfloat GreenGamma;
GLfloat BlueGamma;
GLubyte red, green, blue; /* current drawing color */
unsigned long pixel; /* current color index or RGBA pixel value */
unsigned long clearpixel; /* pixel for clearing the color buffers */
GLuint pixelformat; /* Current pixel format */
GLuint dithered_pf; /* Pixel format when dithering */
GLuint undithered_pf; /* Pixel format when not dithering */
/* For PF_TRUECOLOR */
GLint rmult, gmult, bmult; /* Multiplier */
GLint rshift, gshift, bshift; /* Bit shifts */
unsigned long r_to_pixel[256]; /* Converts red to pixel bits */
unsigned long g_to_pixel[256]; /* Converts green to pixel bits */
unsigned long b_to_pixel[256]; /* Converts blue to pixel bits */
/* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
unsigned long color_table[256]; /* RGB -> pixel value */
/* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
GLubyte pixel_to_r[65536]; /* pixel value -> red */
GLubyte pixel_to_g[65536]; /* pixel value -> green */
GLubyte pixel_to_b[65536]; /* pixel value -> blue */
};
/* Values for XMesa->dest: */
#define FRONT_PIXMAP 1
#define BACK_PIXMAP 2
#define BACK_XIMAGE 4
/* Values for XMesa->pixelformat: */
#define PF_INDEX 1 /* Color Index mode */
#define PF_TRUECOLOR 2 /* TrueColor or DirectColor, any depth */
#define PF_8A8B8G8R 3 /* 32-bit TrueColor: 8-A, 8-B, 8-G, 8-R */
#define PF_8R8G8B 4 /* 32-bit TrueColor: 8-R, 8-G, 8-B */
#define PF_5R6G5B 5 /* 16-bit TrueColor: 5-R, 6-G, 5-B bits */
#define PF_DITHER 6 /* Dithered RGB using a lookup table */
#define PF_LOOKUP 7 /* Undithered RGB using a lookup table */
#define PF_HPCR 8 /* HP Color Recovery (ad@lms.be 30/08/95) */
#define PF_1BIT 9 /* monochrome dithering of RGB */
#define PF_GRAYSCALE 10 /* Grayscale or StaticGray */
/*
* If pixelformat==PF_TRUECOLOR:
*/
#define PACK_RGB( R, G, B ) \
(XMesa->r_to_pixel[R] | XMesa->g_to_pixel[G] | XMesa->b_to_pixel[B])
/*
* If pixelformat==PF_8A8B8G8R:
*/
#define PACK_8A8B8G8R( R, G, B, A ) \
( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
/*
* If pixelformat==PF_8R8G8B:
*/
#define PACK_8R8G8B( R, G, B) ( ((R) << 16) | ((G) << 8) | (B) )
/*
* If pixelformat==PF_5R6G5B:
*/
#define PACK_5R6G5B( R, G, B) ( ((R) << 11) | ((G) << 5) | (B) )
/*
* If pixelformat==PF_DITHER:
*
* Improved 8-bit RGB dithering code contributed by Bob Mercier
* (mercier@hollywood.cinenet.net). Thanks Bob!
*/
#define _R 5
#define _G 9
#define _B 5
#define _DX 4
#define _DY 4
#define _D (_DX*_DY)
#define _MIX(r,g,b) (((r)*_G+(g))*_B+(b))
/*#define _DITH(C,c,d) (((unsigned)((_D*(C-1)+1)*c+d))/(_D*256))*/
#define _DITH(C,c,d) (((unsigned)((_D*(C-1)+1)*c+d)) >> 12)
#define MAXC 256
static int kernel8[_DY][_DX] = {
{ 0 * MAXC, 8 * MAXC, 2 * MAXC, 10 * MAXC},
{12 * MAXC, 4 * MAXC, 14 * MAXC, 6 * MAXC},
{ 3 * MAXC, 11 * MAXC, 1 * MAXC, 9 * MAXC},
{15 * MAXC, 7 * MAXC, 13 * MAXC, 5 * MAXC},
};
static int __d;
#define DITHER( X, Y, R, G, B ) \
(__d = kernel8[(Y)&(_DY-1)][(X)&(_DX-1)], \
XMesa->color_table[_MIX(_DITH(_R, (R), __d), \
_DITH(_G, (G), __d), \
_DITH(_B, (B), __d))])
/*
* If pixelformat==PF_LOOKUP:
*/
#define _DITH0(C,c) (((unsigned)((_D*(C-1)+1)*c)) >> 12)
#define LOOKUP( R, G, B ) \
XMesa->color_table[_MIX(_DITH0(_R, (R)), \
_DITH0(_G, (G)), \
_DITH0(_B, (B)))]
/*
* If pixelformat==PF_HPCR:
*
* HP Color Recovery dithering (ad@lms.be 30/08/95)
* HP has on it's 8-bit 700-series computers, a feature called
* 'Color Recovery'. This allows near 24-bit output (so they say).
* It is enabled by selecting the 8-bit TrueColor visual AND
* corresponding colormap (see tkInitWindow) AND doing some special
* dither.
*/
static short HPCR_DR[2][16] = {
{ 16, -4, 1,-11, 14, -6, 3, -9, 15, -5, 2,-10, 13, -7, 4, -8},
{-15, 5, 0, 12,-13, 7, -2, 10,-14, 6, -1, 11,-12, 8, -3, 9} };
static short HPCR_DG[2][16] = {
{-11, 15, -7, 3, -8, 14, -4, 2,-10, 16, -6, 4, -9, 13, -5, 1},
{ 12,-14, 8, -2, 9,-13, 5, -1, 11,-15, 7, -3, 10,-12, 6, 0} };
static short HPCR_DB[2][16] = {
{ 6,-18, 26,-14, 2,-22, 30,-10, 8,-16, 28,-12, 4,-20, 32, -8},
{ -4, 20,-24, 16, 0, 24,-28, 12, -6, 18,-26, 14, -2, 22,-30, 10} };
extern short hpcr_rTbl[256], hpcr_gTbl[256], hpcr_bTbl[256];
static int _hpcr_x, _hpcr_y;
#define DITHER_HPCR( X, Y, R, G, B ) \
(_hpcr_x=((X)%16), _hpcr_y=((Y)%2), \
( ((hpcr_rTbl[R] + HPCR_DR[_hpcr_y][_hpcr_x]) & 0xE0) \
|(((hpcr_gTbl[G] + HPCR_DG[_hpcr_y][_hpcr_x]) & 0xE0)>>3) \
| ((hpcr_bTbl[B] + HPCR_DB[_hpcr_y][_hpcr_x])>>6) \
) \
)
/*
* If pixelformat==PF_1BIT:
*/
static int kernel1[4][4] = { 0*47, 9*47, 4*47, 12*47,
6*47, 2*47, 14*47, 8*47,
10*47, 1*47, 5*47, 11*47,
7*47, 13*47, 3*47, 15*47 };
#define DITHER_1BIT( X, Y, R, G, B ) \
( ((int)(R)+(int)(G)+(int)(B)) > kernel1[(X)&3][(Y)&3] )
/*
* If pixelformat==PF_GRAYSCALE:
*/
#define GRAY_RGB( R, G, B ) XMesa->color_table[(R) + (G) + (B)]
#define XIMAGE None
/*
* Converts a GL window Y coord to an X window Y coord:
*/
#define FLIP(Y) (XMesa->bottom-(Y))
/*
* Return the address of a 1, 2 or 4-byte pixel in the back XImage:
* X==0 is left, Y==0 is bottom.
*/
#define PIXELADDR1( X, Y ) \
( XMesa->ximage_origin1 - (Y) * XMesa->ximage_width1 + (X) )
#define PIXELADDR2( X, Y ) \
( XMesa->ximage_origin2 - (Y) * XMesa->ximage_width2 + (X) )
#define PIXELADDR4( X, Y ) \
( XMesa->ximage_origin4 - (Y) * XMesa->ximage_width4 + (X) )
/*
* External variables:
*/
extern XMesaContext XMesa;
/*
* External functions:
*/
extern void xmesa_alloc_back_buffer( XMesaContext c );
extern void xmesa_setup_DD_pointers( void );
extern points_func xmesa_get_points_func( void );
extern line_func xmesa_get_line_func( void );
extern polygon_func xmesa_get_polygon_func( void );
#endif